In the installation process of bearings, one principle must be grasped, that is, the installation force or torque can only be transmitted through the corresponding ring.

Force fit

When the inner ring of the bearing is tightly matched with the shaft and the outer ring is loosely matched with the bearing seat hole, the bearing can be pressed and installed on the shaft by the press first, and then the shaft is loaded into the bearing seat hole together with the bearing. During the pressing, an assembly sleeve (copper or mild steel) made of soft metal material is mounted on the end face of the inner ring of the bearing (copper or mild steel).

The outer ring of the bearing is tightly matched with the bearing seat hole. When the inner ring and the shaft are loosely matched, the bearing can be pressed into the bearing seat hole first. At this time, the outer diameter of the assembly sleeve should be slightly less than the diameter of the seat hole.

If the bearing ring is tightly matched with the shaft and the seat hole, the inner ring and the outer ring should be pressed into the shaft and the seat hole at the same time, and the structure of the assembly sleeve should be able to tighten the end face of the inner ring and the outer ring of the bearing at the same time.

Heating with

An installation method in which a tight fit is transformed into a loose fit by thermal expansion by heating a bearing or a bearing seat.It is a common and labor-saving installation method.This method is suitable for the installation of bearings with large interference amount. Before hot loading, put the rings of bearings or separable bearings into the oil tank for uniform heating of 80-100℃, and then take them out of the oil and install them on the shaft as soon as possible. In order to prevent the end face of the inner ring and the shaft shoulder from fitting tightly after cooling, the bearings can be tightened axially after cooling.When the outer ring of the bearing is tightly matched with the bearing seat made of light metal, the hot charging method of heating the bearing seat is adopted to avoid the scratch on the matching surface.

Heating tank with bearing and should be at a certain distance from the bottom of a mesh, hanging hooks in the bearings, bearing on the bottom, in case of heavy impurities into the bearing or uneven heating, fuel tank must have a thermometer, strictly control the oil temperature shall not exceed 100 ℃, in order to prevent the tempering effect, reduce the hardness of the ring.

Installation of thrust bearing

The balance between the thrust bearing and the shaft is generally the transition match, and the match between the seat ring and the bearing seat hole is generally the clearance match, so this kind of bearing is easier to install. The central shaft spring of the two-way thrust bearing should be fixed on the shaft to prevent rotation relative to the shaft.

The installation method of bearings is generally shaft rotation, so the fit between the inner ring and shaft is interference fit, and the fit between the outer ring and the bearing chamber is clearance fit.

Inspection of bearing operation

After the bearing is installed, it should be checked to ensure that the bearing is installed in place, rotating flexible and without jamming. If the bearing is improperly installed, it will cause the bearing temperature to rise rapidly and damage, and even major accidents such as bearing jamming and fracture occur.

Use and storage of bearings

(1) When the bearing is in use, keep the surrounding environment clean and do not stick hand sweat and dirt.Provide for the use of personnel familiar with bearings, especially need to be careful of injuries, indentation, underloss, etc.In order to ensure the service performance of the bearing, the bearing should be regularly maintained, maintained and overseen according to the operation standard of the equipment, including monitoring the running state, adding lubricant and regular disassembly inspection.

(2) The bearing shall not be stored directly on the ground (more than 30cm above the ground), and direct light and cold walls shall be avoided.In order to prevent rust, the bearing is placed in acidic air when the temperature is about 20 ° C and the humidity is below 65%. It is easy to rust and become discolored. It is necessary to wipe the bearing, shaft and shell with gloves and kapok recycle.